If the United Nations ever got an anthem, it would probably sound like this cacophony of the 193 anthems in the organisation. It doesn't sound that bad at the beginning then it starts getting bad, when "all their final crescendoes occurring simultaneously, in one giant mega-crescendo." Scary.
According to its creator, "the piece begins with the national anthem of Uruguay, Himno Nacional de Uruguay, which is commonly regarded as the longest in the world, and usually runs between four and seven minutes in performance. Seven seconds later, the anthem of Guatemala (Himno Nacional de Guatemala, colloquially known as Guatemala Feliz!) enters, followed soon after by the distinctive drums and trumpets of the Algerian anthem Qassaman. Then, in quick succession, there is Mexico, Turkey, Brazil and Vietnam. Most of the rest of the South American anthems enter at this point, along with a couple of European anthems, and Libya."
And so on. He synchronised the anthems around the crescendo itself, which is why some anthems start earlier than others.